Why does one want to replace a zero-row data.frame with a one-row data.frame of NA's? Unless this is for an external program that cannot handle zero-row inputs, this suggests that there is an unnecessary limitation (i.e., a bug) in the R code that uses this data.frame.
Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On > Behalf Of arun > Sent: Wednesday, July 11, 2012 10:03 AM > To: Liviu Andronic > Cc: R help > Subject: Re: [R] fill 0-row data.frame with 1 line of NAs > > Hi, > > Try this: > .xa<-iris[1,][rep(NA,length(iris),1),] > .xa > # Sepal.Length Sepal.Width Petal.Length Petal.Width Species > #NA NA NA NA NA <NA> > #or > > .xb<-iris[1,][rep(NA,ncol(iris),1),] > .xb > # Sepal.Length Sepal.Width Petal.Length Petal.Width Species > #NA NA NA NA NA <NA> > > > A.K. > > > ----- Original Message ----- > From: Liviu Andronic <landronim...@gmail.com> > To: "r-help@r-project.org Help" <r-help@r-project.org> > Cc: > Sent: Tuesday, July 10, 2012 9:15 AM > Subject: [R] fill 0-row data.frame with 1 line of NAs > > Dear all > Is there a simpler method to achieve the following: When I obtain an > empty data.frame after subsetting, I need for it to contain one line > of NAs. Here's a dummy example: > > (.xb <- iris[ iris$Species=='zz', ]) > [1] Sepal.Length Sepal.Width Petal.Length Petal.Width Species > <0 rows> (or 0-length row.names) > > dim(.xb) > [1] 0 5 > > (.xa <- data.frame(matrix(rep(NA, ncol(.xb)), 1))) > X1 X2 X3 X4 X5 > 1 NA NA NA NA NA > > names(.xa) <- names(.xb) > > (.xb <- .xa) > Sepal.Length Sepal.Width Petal.Length Petal.Width Species > 1 NA NA NA NA NA > > > The solution I came up with is way too convoluted. Anything simpler? Regards > Liviu > > > -- > Do you know how to read? > http://www.alienetworks.com/srtest.cfm > http://goodies.xfce.org/projects/applications/xfce4-dict#speed-reader > Do you know how to write? > http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
